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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <style>
        .bgs .one {
            width: 500px;
            height: 300px;
            background-image: url(./b_d953d23388c151b4d1b2533729093198.jpg);
            background-repeat: no-repeat;
            background-position: center;
            background-size: cover;
        }
    </style>
    <div class="bgs">
        <div class="one">背景尺寸</div>
    </div>
</body>

</html>